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M44 Remark Code: Condition Code Missing or Invalid

M44 means the payer found a condition code on the claim that is missing, incomplete, or invalid. Condition codes describe circumstances that affect how an institutional claim is processed, so the payer could not adjudicate it.

Quick facts

Code
M44 (RARC M44)
Status
Active In use since January 1, 1997; last modified February 28, 2003.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The claim or line is unpaid until the condition code is corrected. The patient is not billed for a coding error.
Official description
Missing/incomplete/invalid condition code.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What M44 means

Condition codes are two-character codes on institutional claims that tell the payer about special circumstances: why an adjustment claim is being sent, whether a patient is in a particular program, or other situations that change processing. M44 says one of these codes was missing when the payer needed it, was formatted wrongly, or is not valid for this claim type or date.

The remark usually accompanies CARC 16 and often leads to the claim being returned as unprocessable.

Common causes

  • An adjustment or replacement claim was sent without the claim change reason condition code.
  • A code was used that is not valid for the bill type.
  • A retired code was used, or the code conflicts with another field on the claim.
  • The condition code required by a payer-specific policy was omitted.
  • A clearinghouse mapping dropped the code.

How to fix it

  1. Check the payer’s edit message or remittance to identify which condition code is at issue.
  2. Compare it against the current NUBC code list and the payer’s billing manual.
  3. Correct form locators 18-28 or the electronic equivalent.
  4. Resubmit as a new claim if returned unprocessed, or as an adjustment with the right bill type frequency and claim change reason.

How to prevent it

Keep your billing system’s condition code tables current with NUBC updates and add edits for codes required on adjustment claims. Front-end scrubbing with the Claims Validator can catch invalid combinations. See claim rejection vs denial.

Codes that may appear with M44

  • CO-16 (Claim/service lacks information or has submission/billing error(s).): The claim lacks information or has billing errors, here the condition code.
  • CO-A1 (Claim/Service denied.): Some payers report the rejection as a claim-level denial with the remark explaining it.
  • M45 (Missing/incomplete/invalid occurrence code(s).): The occurrence code, which records a dated event, is the problem instead.
  • M49 (Missing/incomplete/invalid value code(s) or amount(s).): A value code or amount is missing or invalid.
  • MA30 (Missing/incomplete/invalid type of bill.): The type of bill is missing or invalid, another institutional header field.

M44 FAQ

Where are condition codes on the UB-04?

In form locators 18 through 28. Electronic institutional claims carry them in the condition information segment.

What kind of information do condition codes carry?

Circumstances such as the patient's employment or accident status, special program indicators, claim change reasons on adjustment bills, and billing situation flags defined by the National Uniform Billing Committee.

Do professional claims use condition codes?

Rarely. Condition codes are mainly an institutional claim element, though some professional claim scenarios use similar indicators.